Grate.



PATENTBD 00T. 6, 1903.

I H. E. "PARSOBL GRATE.

APPLIUATION FILED JULY 2z, -1 902` N0 MODEL.

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@tf-omega Patented October 6,1903.

I PATENT Fries.

HENRY E. PARSON, OF BROOKLYN, NEW' YORK.

. .cRATe SIECIFIGATION forming part 'cf Letters Patent No. 740,463, dated October 6, 1903.

Application llled July 22, 1902. Serial No. 116587. (No model.)

.T0 all", whom, i?? 7er/ay concern/.-

Be it known that I, HENRY E. PARSON', a citizen of the United States of America, and a resident ofthe borough of Brooklyn, city and State of New York, have invented certain new and useful Improvements in Gratos, of which the following is a specification.

This invention relates to limprovements in grates, (shown and described in my Patent No. 702,585, dated January 17, 1902,) and isV 'and to meet this emergency and at the saine time maintain uniformity in the arrangement of the tapered openings I provide supports disposed under the tubes on which the gratesections rest that a space can be formed intermediate said tubes'to permit a free circulation of air; but in order to make the circulation perfect and effective I provide the edges of the bars adjacent the tubes with tapered grooves, which form a row of tapering openings when the sections are assembled. The taper to the openings lends force to the air, said force tending to draw the extremely highly heated air from the space surrounding the tubes Without materially affecting the heatingof the water.

lTo this end my invention consists of a plurality of perforated gratesections having their edges concaved and provided along said concaved surfaces with a row of tapering grooves.

In the drawings, Figure lis a top plan vier;r of my improved grate. Fig. 2 is a side elevation. Fig. 3 is a cross-section of the vsaine on the `line 3 3. Fig. Liis a bottom plan view of one of the grate-sections. Fig. 5 is a diagrammatic view illustrating the relative positions of a grate-section and a tube.

Inasmuch as the grate-sectionsfare substanl tially alike, I Will describe only one in detail.

In outline the section is preferably rectangular and has at each end a projection 3 and recess 4, while the edges are concaved suficien tly to lit over but not to touch the pipes I. A series of tapered openings 5 are provided throughout the area of the section arranged in rows in staggered uniform position -relatively to one another, the smallest part of the openings being at the top. Any num; ber of thesel openings may be provided, and to 'carry out the symmetry throughout the whole grate-surface when the sections are assembled I find it importantto obtain satisfactory results to have the tapering openings at the meeting edges of said sections. To this end tapering grooves 6 are formed in the surface of the coneaved edges, such grooves being positioned to form part of a row of ta pering openings.

The peculiar shape of the section, coupled with the fact that the concave edges are grooved, weakens the structure, and to olset this I utilize the serpentine-shaped flange 7, which extends longitudinally through the entire'length of the section and is arranged tangentially, or nearly so, to the lower edges of the openings 5, as clearly shown and described in my before-mentioned patent. The grooves 6, combined with the concave formation of the edges, render -the grate susceptible to great chances of bending, and'consequently breaking under the iniiuences of heat and cold; but this is obviated bythe reinforcingvflange 7,- Which running, as it does, intermediate the openings effectually prevents this occurring.

Acrossbar 8 is positioned under each end of a section and receives the Whole Weight of the same.

To assemble the sections to form a grate,

the tubes of course are intact, as they form a part of the boiler structure. The supports 8 are put in place, and then the sections are dropped in the spaces intermediate the tubes,

IOO

being wholly supported by said bars 8. In placing the sections the projection 3 of one fits the groove 4 of the adjacent section, and, if desired, these projections may be corrugated for the admission of air. A grate thus constructed has many decided advantages, paramount of which is the introduction of air to the fuel in a uniform series of jets irrespective of the adjoining edges of the sections, and, further, the openings being of tapering formation at the concave edges the heated air is drawn from the space surrounding the tubes, affording ample protection against the burning of them out and in the meantime heats the air in the space somewhat prior to the time it is jetted to the fuel.

Those familiar with the promotion of combustion recognize the importance of jetting air into the bed of fuel with some degree of uniformity; but it has been practically impossible to do this where tubes were used as I have herein indicated.

The arrangement of openings prevents the formation of dead-spaces on the grate and serves to permit the jets of air to permeate the fuel.

The respective sections areprevented from contacting with the pipes by the outer sections bearing against the sides of the lire-box, thus holding all of them in proper relative position. 4

1. As a new article of manufacture, a perforated grate-section having two of its edges concaved in cross-section and provided in the surface of the concaved edges with tapered grooves, substantially as described.

2. As a new article of manufacture, a gratesection provided withauniformly-distributed series of tapered openings, two edges of the sections being concaved in cross-section and provided in the surface of the concaved edges with a series of tapering grooves, equal to half the area of the tapered openings, substantially as described.

3. As a new article of manufacture, a gratesection provided with a series of tapering openings uniformly distributed throughout its area, a serpentine flange on the under side of the section which passes between the tapering openings without interfering with them, the edges of the section being concaved,

and provided with tapering grooves in the surface of the concaved edges to forma part of a row of the uniformly-distributed tapering openings, substantially as described'.

.4. The combination with a plurality of spaced-apart water-tubes of a boiler, of a plurality of grate-sections interposed in said spaces having rows of tapering perforations and concaved edges formed adjacent said tubes, and a series of tapering grooves formed in the surface of the concaved edges adapted to register withl similar grooves of adjoining sections to form a'row of tapered openings, substantially as described.

5. The combination with a plurality of spaced-apart water-tubes of a boiler, a plurality of grate-sections interposed in said spaces, having rows of tapered openings, concaved edges formed adjacent said tubes of larger area than the tubes, and a series of tapering grooves formed in the surface of the concaved edges, the concaved edges forming spaces around the tubes while the grooves form a row of tapering openings when the grate-sections are assembled, substantially as described.

6. The combination with a tirebox, of a plurality of spaced-apart tubes, a series of gratesections provided with tapering openings, and the outer edges of the sections adjacent the tubes beingconcaved and provided with aseries of tapering grooves, means for maintaining the sections intermediate the tubes but not touching the latter, and the tapering grooves of adjoining sections forming a row of tapering openings when the grate is assembled, substantially as described.

7. As a new article of manufacture, a perforated grate-section having two of its edges concaved in cross-section and provided in the surface ofthe concaved edges with grooves, substantially as described.

Signed by me at New York city, county and State of New York, this 15th day of July,

HEN RY E. PARSON.

Witnesses:

- `PAUL BoNYNGn,

EMMA W. FINLAYsoN. 

